<template>
  <div class="login-container">
    <div class="login-box">
      <!-- 头像区域 -->
      <div class="avatar-box">
        <img
          src="../assets/logo.png"
          alt=""
        >
      </div>
      <!-- 登录表单区域 -->
      <el-form
        ref="loginFormRef"
        label-width="0px"
        class="login-form"
        :model="loginForm"
        :rules="loginFormRules"
      >
        <el-form-item prop="username">
          <el-input
            v-model="loginForm.username"
            prefix-icon="iconfont icon-user"
            placeholder="帐号/邮箱/电话号码"
          />
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            prefix-icon="iconfont icon-password"
            type="password"
            placeholder="请输入登录密码"
          />
        </el-form-item>
        <el-form-item class="btns">
          <el-button
            type="primary"
            @click="login"
          >
            登录
          </el-button>
          <el-button
            type="info"
            @click="resetLoginForm"
          >
            重置
          </el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456',
      },
      // 表单的验证规则对象
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入登录帐号', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' },
        ],
        // 验证登录密码是否合法
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' },
        ],
      },
    }
  },
  methods: {
    // 单击重置按钮，重置登录表单
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields()
    },
    login() {
      this.$refs.loginFormRef.validate(async (valid) => {
        if (!valid) return

        const { data: res } = await this.$http.post('login', Object.assign({}, this.loginForm))
        if (res.meta.status !== 200) return this.$message.error('登录失败!')

        this.$message.success('登录成功!')
        // 1、将登录成功之后的 token 保存到客户端的 sessionStorage 中
        // 1.1 项目中除了登录之外的其他API接口、必须在登录之后才能访问
        // 1.2 token 只应在当前网站打开期间生效、所以将 token 保存在 sessionStorage 中
        // 2、通过编程式导航跳转到后台主页、路由地址是 /home
        window.sessionStorage.setItem('token', res.data.token)
        this.$router.push('/home')
      })
    },
  },
}
</script>

<style lang="less" scoped>
.login-container {
  background-color: #2b4b6b;
  height: 100vh;

  .login-box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar-box {
      position: absolute;
      width: 130px;
      height: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }

    .login-form {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;

      .btns {
        display: flex;
        justify-content: flex-end;
      }
    }
  }
}
</style>
